PDF malware analysis — malicious · ab84493f2b433040

MALICIOUS

PDF

81.3 KB Created: 2021-07-02 01:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 2da2b2fb444352308dc16b7020592a51 SHA-1: 6f42f6a0c5895b4e8ba4fe2f49b7b95d91c965c4 SHA-256: ab84493f2b433040ba7cb7c1adf8092fda6be72d5c9401b97b58768458fcb623

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links pointing to various domains, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, but the presence of many external URIs and the high confidence detection scores suggest a link farm designed to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9833

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM

PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
External URI info PDF_URI

PDF contains an external URL action
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://chcial.ru/uplcv?utm_term=who+were+the+brothers+and+sisters+of+jesus PDF link annotation
- https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/tpa533adpf9vgqmbjqtfh6qf69/9728946281.pdfIn PDF document text
- https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7e913974a---totusatakuzuja.pdfIn PDF document text
- https://daiichigroup.net/uploads/news_file/davumedufafaxo.pdfIn PDF document text
- https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607136434e79f---bajozabibobo.pdfIn PDF document text
- http://midlandhigh65.com/clients/6/68/682e31fde28f8c6bff7ebba57332ef5f/File/9310614970.pdfIn PDF document text
- https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/5b298dd6d21c7f136ea5811a7f69f8ce/zaragokeme.pdfIn PDF document text
- http://muacuoi.vn/Pictures/files/66635923699.pdfIn PDF document text
- http://odesignlab.ru/admin/ckfinder/userfiles/files/89245750988.pdfIn PDF document text
- http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0f22a0202---97520496305.pdfIn PDF document text
- http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/d5a67c6b3d3d863dbc1ac7c86ee2403f/63890296593.pdfIn PDF document text
- http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609879eae8dcf---5774595027.pdfIn PDF document text
- https://aashianarealty.com/file/14086549145.pdfIn PDF document text
- https://lederstuehle-shop.de/ckfinder/userfiles/files/87119926515.pdfIn PDF document text
- https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aac74cbdab---7442041049.pdfIn PDF document text
- http://tangiahoang.com/skinkorea/Images_upload/files/5911910508.pdfIn PDF document text
- http://sattamatkapatti.com/userfiles/file/7682147633.pdfIn PDF document text
- http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fab7d3f2d---zonukedivizu.pdfIn PDF document text
- http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fde16fca8---terajaweluvijom.pdfIn PDF document text
- http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16080fc7210653---tukosusowajitizefujasi.pdfIn PDF document text
- http://asesorgubernamental.com/images/file/medupevi.pdfIn PDF document text
- https://micast.de/wp-content/plugins/super-forms/uploads/php/files/hi5938ld30k58vgmgfa368id3d/26278998985.pdfIn PDF document text
- http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad4d325c0d---61473026874.pdfIn PDF document text
- https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/07fae48c2970140290b702e461d8d14f/lawanised.pdfIn PDF document text
- http://teenmag.cz/userfiles/file/romowolelufolipikexis.pdfIn PDF document text
- https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/r4hv8ski7c18dic4vg80mjgiqt/22051993361.pdfIn PDF document text
- http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcfe8140af---gebaxafixibure.pdfIn PDF document text
- https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b1135565---85217670770.pdfIn PDF document text
- http://montaze.org/democms/userfiles/file/89480742890.pdfIn PDF document text
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000db5f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB5F	16568 bytes
SHA-256: `156292c2a2e9c1050460c4edf53d858259b6ac5f09bf00edd196e154fbe2cdb3`
`font_01_sfnt_off0001066f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1066F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011e86.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E86	10856 bytes
SHA-256: `2784ca8c53ca814e3a5c9f295f60c0301a160bf46fd7af4e4ac799b913cdc165`

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